Marine VHF Audio and Signalling Processor LQFP package
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Product Description

The CMX885 is a half-duplex, audio, signalling and data processing IC for use in Marine VHF radio systems.

Comprehensive audio processing facilities include complete audio processing, filtering, pre- or de-emphasis and frequency inversion scrambling. Signal routing and filtering is included to assist host µC based signal encoding/decoding applications.

1200bps Digital Selcall (DSC) or Automatic Transmitter Identification System (ATIS) modem with protocol support and NWR decoding are supported.

A DTMF encoder/decoder, a full complement of auxiliary ADCs and DACs and dual synthesised clock outputs are included in this low power PMR processor. The device also has flexible powersaving modes and is available in 48-pin VQFN and LQFP packages.


  • Concurrent Audio/Signalling/Data Operations
  • Complete Audio-band Processing: o Selectable Audio Processing Order o Pre and De-emphasis o Selectable 2.55/3.0 kHz Filtering o Limiter
  • DSC/ATIS Modem for Marine Applications
  • DSC/ATIS Modem for Marine Applications
  • Programmable Voice Scrambler
  • Inband Signalling: DTMF, NOAA NWR
  • C-BUS Serial Interface to Host µController
  • DTMF and Audio Tone Encoder/Decoder
  • Dual Auxiliary ADC, 4 Multiplexed Inputs
  • 4 x Auxiliary DACs
  • Tx Outputs for Single, Two-Point Modulation
Voltage:3.0 to 3.6 VDC
Form factor:48-pin LQFP
Temperature:-40 to +85 °C
Dimensions:9.0 x 9.0 x 1.5 mm
Current:5.75 mA
Reference Frequency Input:3.6864 to 24.576 MHz
Duplex Mode:Half Duplex
Signal IO format:DSC / ATIS
Baud Rate:1200
C-BUS (SPI) Control Interface:yes